As of December 31, 2011, he had a 5 percent stake in the company at about 26.8 million shares

One of BlackBerry's (TSE:BB; TSE:RIM) former co-chief executive officers has sold his entire stake in the company.

BlackBerry's ex-CEO Jim Balsillie revealed in Thursday's regulatory filing that he had sold his entire stake in the company before the end of 2012. As of December 31, 2011, he had a 5 percent stake in the company at about 26.8 million shares.